# operator 高阶函数和可调用对象上的操作
import operator

print(operator.add(1, 2))  # 3
print(operator.concat('Hello', 'World'))  # HelloWorld
print(operator.contains(['my', 'name', 'is', 'Sunli'], 'is'))  # True
a = 'hello'
print(operator.iadd(a, ' world'))  # hello world
